ill import this now,
in file explorer you can right click on the .vsxproj for libbitcoin-system and open in a text editor like notepad++
When you scroll down, you'll find many lines like these references the nuget packages:
<Import Project="$(NuGetPackageRoot)boost_thread-vc141.1.64.0.0\build\native\boost_thread-vc141.targets" Condition="Exists('$(NuGetPackageRoot)boost_thread-vc141.1.64.0.0\build\native\boost_thread-vc141.targets')" />
When i updated them, it generated new versions of these import project lines of code, but didnt remove the older lines import projects code.
When building it tried to import the wrong versions causing it to say that they were missing